How do Instant Messages show up on my phone bill?

I have unlimited texting with verizon wireless. If I were to use the Instant Messager system every "IM" through (AIM, MSN messenger, or Yahoo) would count as a text, but how would this be displayed on my phone bill or will it be displayed at all?

Charlyee, it will show the amount of kb usage for the current day on my OLAM, however, it does not display this on my bill, and the next day it always starts out at zero again, when I check my usage on line.

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Ellen, thanks. This part is also different, mine never zeroes out within the billing cycle,